CN216978762U

CN216978762U - Core fluid quantitative saturation-displacement device

Info

Publication number: CN216978762U
Application number: CN202220511357.6U
Authority: CN
Inventors: 刘虎; 杨威; 黄毅; 王东强; 彭旭; 何思源; 李夏伟; 张烨毓; 刘迪
Original assignee: KEYUAN ENGINEERING TECHNICAL TEST CENTER OF SICHUAN PROVINCE
Current assignee: Sichuan Keyuan Engineering Technology Test Center Co.,Ltd.
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-07-15
Anticipated expiration: 2032-03-09

Abstract

The utility model discloses a core fluid quantitative saturation-displacement device, which comprises a nitrogen cylinder, a pressurization system, a core holder and a drying tube which are sequentially connected, wherein two ends of the core holder are respectively connected with the pressurization system and the drying tube through six-way valves, a control valve and a pressure regulating valve are sequentially arranged on a pipeline between the pressurization system and the six-way valves, a scale test tube and a pressure sensor are respectively connected onto the two six-way valves, and a precision balance is arranged at the bottom of the drying tube; still include confined pressure system, evacuation system and pc terminal, confined pressure system is connected with rock core holder middle part to be provided with pressure sensor, evacuation system passes through the four-way connection and is connected with two six-way valves respectively, still be connected with the vacuum gauge on the four-way connection, the pc terminal is connected with vacuum gauge and every pressure sensor respectively. According to the utility model, the nitrogen can be used for displacing the saturated fluid in the core, so that the quantitative saturation of the core is realized, and the efficiency of subsequent experiments is effectively improved.

Description

Core fluid quantitative saturation-displacement device

Technical Field

The utility model belongs to the technical field of oil and gas field development experimental equipment, and particularly relates to a core fluid quantitative saturation-displacement device.

Background

In the technical field of oil and gas development experiments, the rock core can be subjected to saturation operation according to different experimental requirements. The existing core vacuumizing saturation device can only perform complete saturation operation, the saturation degree of different gradients is set for the same core in most experiments, the original device cannot perform quantitative saturation according to specific experiment requirements, if the required target water saturation degree is required to be achieved, a high-speed centrifugation method is generally adopted, but the method easily causes core crushing, and the experiment result has large error, so that the experiment efficiency is influenced. Therefore, a displacement device capable of achieving quantitative saturation of core fluid is provided.

Disclosure of Invention

The utility model aims to solve the technical problem of the prior art, and provides a core fluid quantitative saturation-displacement device which is simple and convenient to operate and can quantitatively saturate a core according to experimental requirements.

The technical scheme adopted by the utility model is as follows: a rock core fluid quantitative saturation-displacement device comprises a nitrogen cylinder, a pressurization system, a rock core holder and a drying tube which are sequentially connected, wherein two ends of the rock core holder are respectively connected with the pressurization system and the drying tube through six-way valves, a control valve and a pressure regulating valve are sequentially arranged on a pipeline between the pressurization system and the six-way valves, two six-way valves are respectively connected with a scale test tube and a pressure sensor, and the bottom of the drying tube is provided with a precision balance;

the core holder is characterized by further comprising a confining pressure system, a vacuumizing system and a pc terminal, wherein the confining pressure system is connected with the middle of the core holder and provided with pressure sensors, the vacuumizing system is connected with two six-way valves through four-way joints respectively, a vacuum gauge is further connected to each four-way joint, and the pc terminal is connected with the vacuum gauge, the precision balance and each pressure sensor respectively.

Preferably, the vacuum pumping system comprises a mechanical vacuum pump and a molecular vacuum pump, the mechanical vacuum pump and the molecular vacuum pump are connected with a four-way joint through a three-way joint, and control valves are respectively arranged on pipelines connected with the three-way joint through the mechanical vacuum pump and the molecular vacuum pump.

The utility model has simple structure and convenient operation, can realize quantitative saturation of the rock core by displacing saturated fluid in the rock core through nitrogen, effectively improves the efficiency of subsequent experiments, realizes small error of quantitative saturation, and provides guarantee for the subsequent experiments.

Drawings

FIG. 1 is a system diagram of the present invention.

In the figure: 1. a nitrogen gas cylinder; 2. a pressurization system; 3. a core holder; 4. a drying tube; 5. a six-way valve; 6. a pressure regulating valve; 7. a graduated test tube; 8. a precision balance; 9. a confining pressure system; 10. a vacuum pumping system; 11. a pc terminal; 12. a vacuum gauge; 101. a mechanical vacuum pump; 102. a molecular vacuum pump.

Detailed Description

The utility model will be described in further detail with reference to the following drawings and specific embodiments.

Examples

As shown in fig. 1, the present embodiment provides a core fluid quantitative saturation-displacement device, which includes a nitrogen cylinder 1, a pressurization system 2, a core holder 3, a drying tube 4, and two six-way valves 5, which are connected in sequence, wherein one valve port of one of the six-way valves 5 is connected to an inlet of the core holder 3, one valve of the other six-way valve 5 is connected to an outlet of the core holder 3, the two six-way valves 5 are further connected to a pressure sensor and a scale test tube 7, respectively, and a saturated fluid is filled in the scale test tube 7; the pipeline between the six-way valve 5 and the scale test tube 7 is preferably a transparent hose, so that the inflow condition of saturated fluid can be visually observed when the rock core is saturated, and air can be effectively prevented from being sucked into the rock core; a valve port of a six-way valve 5 connected with an inlet of a core holder 3 is connected with a pressurizing system 2 through a pipeline, a control valve and a pressure regulating valve 6 are further sequentially installed on the pipeline connecting the pressurizing system 2 and the six-way valve 5, an air inlet end of the pressurizing system 2 is connected with a nitrogen cylinder 1, a valve port of the six-way valve 5 connected with an outlet of the core holder 3 is connected with a drying tube 4 through a pipeline, the bottom of the drying tube 4 is provided with a light-weight fixed support, the bottom of the drying tube 4 is provided with a precision balance 8, the drying tube 4 is arranged on the precision balance 8 and is provided with a light-weight fixed support, the drying tube 4 can be prevented from moving on the precision balance 8, and errors caused by the movement of the drying tube 4 are avoided;

the wafer pressure system is connected with the middle part of the rock core holder 3, and the pressure of wafer pressure is monitored in real time by arranging a pressure sensor;

the vacuum pumping system 10 comprises a mechanical vacuum pump 101 and a molecular vacuum pump 102, wherein the mechanical vacuum pump 101 and the molecular vacuum pump 102 are respectively connected with two joints of a three-way joint through pipelines, a control valve is arranged on a connecting pipeline, the other joint of the three-way joint is connected with one interface of the four-way joint, one joint of the rest three joints of the four-way joint is provided with a vacuum gauge 12, and the other two joints are respectively connected with one valve on the six-way valve 5 through pipelines;

and the pc terminal 11 is respectively connected with the vacuum gauge 12, the precision balance 8 and each pressure sensor and is used for acquiring data to monitor in real time and calculate the saturation of the rock core.

The working process is as follows:

the dried rock core is loaded into the rock core holder 3, and certain confining pressure is applied to the rock core holder 3 through a confining pressure system 9;

closing the rest valves on the two six-way valves 5, opening the valves connected with the core holder and the four-way joint, opening the control valve for controlling the mechanical vacuum pump 101, closing the control valve for controlling the molecular vacuum pump 102, performing primary evacuation in the core holder 3 through the mechanical vacuum pump 101, closing the control valve for controlling the mechanical vacuum pump 101 after the primary evacuation, opening the control valve for controlling the molecular vacuum pump 102 to perform secondary evacuation, and executing the primary evacuation and the secondary evacuation according to the experimental standard;

after the air is pumped out, a valve port connected with the four-way connector on the six-way valve 5 is closed, a valve connected with the scale test tube 7 on the six-way valve 5 is opened, saturated fluid in the scale test tube 7 is sucked by negative pressure in the rock core holder 3 and enters the rock core holder 3, the amount of the saturated fluid is calculated according to the porosity of the rock core, and the rock core reaches a 100% saturated state after the saturated fluid completely flows into the rock core holder 3;

after saturation, a valve on the six-way valve 5 is closed, a valve port valve which is arranged on the six-way valve 5 and is close to an inlet of the core holder 3 and is connected with the pressurizing system 2, a valve port valve which is arranged on the six-way valve 5 and is close to an outlet of the core holder 3 and is connected with the drying pipe 4, a control valve between the pressurizing system 2 and the six-way valve 5 is opened, nitrogen in the nitrogen bottle 1 is pressurized by the pressurizing system 2 and then is discharged into the core holder 3, the inlet pressure is controlled by a pressure regulating valve 6 before the nitrogen is discharged, the confining pressure of the core holder 3 is guaranteed to be always greater than the pressure 2Mpa at the inlet of the core holder 3, the saturation of the core is calculated by regulating the displacement pressure and observing the readings of the drying pipe 4 and the precision balance 8, so that the regulation control of the saturation of the core is realized, and the displacement operation is stopped after the required saturation is reached.

According to the utility model, after the pore volume can be calculated through the porosity, the corresponding saturated fluid is directly sucked through the core according to the required saturation, so that the core reaches the required saturation; alternatively, after the core reaches a hundred percent saturation, the displacement may achieve successively lower saturations, for example, 100% to 70% to 50% to 20%, so as to achieve saturation of the same core at different gradients.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.

Claims

1. A rock core fluid quantitative saturation-displacement device is characterized in that: the device comprises a nitrogen cylinder (1), a pressurization system (2), a rock core holder (3) and a drying pipe (4) which are sequentially connected, wherein two ends of the rock core holder (3) are respectively connected with the pressurization system (2) and the drying pipe (4) through six-way valves (5), a control valve and a pressure regulating valve (6) are sequentially arranged on a pipeline between the pressurization system (2) and the six-way valves (5), two six-way valves (5) are respectively connected with a scale test tube (7) and a pressure sensor, and the bottom of the drying pipe (4) is provided with a precision balance (8);

still include confined pressure system (9), evacuation system (10) and pc terminal (11), confined pressure system (9) are connected with rock core holder (3) middle part to be provided with pressure sensor, evacuation system (10) are connected with two six-way valves (5) respectively through the cross joint, still be connected with vacuum gauge (12) on the cross joint, pc terminal (11) are connected with vacuum gauge (12), precision balance (8) and every pressure sensor respectively.

2. The core fluid quantitative saturation-displacement device according to claim 1, characterized in that: the vacuum pumping system (10) comprises a mechanical vacuum pump (101) and a molecular vacuum pump (102), the mechanical vacuum pump (101) and the molecular vacuum pump (102) are connected with a four-way joint through a three-way joint, and control valves are arranged on pipelines connected with the three-way joint through the mechanical vacuum pump (101) and the molecular vacuum pump (102).